The rigid motion of thebody is measured in its carrier coordinate system and the elastic deformation is described inthe body coordinate system, so that the orthogonality of the transformation matrix is fully u-tilized and the nonlinear couplings between rigid motion .

In order to adhere to its own ruling of feudalism,ancient China s rulers attached great importance to the election, control and management,and set up complete and regular systems of official administration,one of which was the system of recommendation and implication,a combination of China s ancient spirit to recommend talents and be involved in implication.

The connector is made up of upper joint, slotted steel ball, O-ring, locking pin, slotted sliding sleeve, coupling sleeve, setting ball, setting sliding sleeve, adjusting spring and lower joint The string combined with dual-stage and high efficiency connector + differential packer not only can be .